Heel-building machine



A. A. HUDSON HEEL BUILDING MACHINE .Eune 3 1924 M 7" l l v l m n n. A .QW .w H

.5 Sheets-Sheet 1 if FT'W1 HEEL BUILDING MACHINE Filed April 16, 1921 3Sheets-Sheet 2 f" f a A. A; HUDSON HEEL BUILDING MACHINE June 3 1924.

Filed April 1 1921 I5 Sheets-Sheet 5 m \EQEF QW w H.

ALEXANDER A. HUDSON, ARTHUR J.

Application filed April 16, 1921.

STATES PATE OF CINCINNATI, OHIO, ASSIGNOR OF ONE-FOURTH T0 UNDERWOOD, 0FBELLEVUE, KENTUCKY.

HEEL-BUILDING MACHINE.

T 0 all whom it may concern.

Be it known that I, ALEXANDER A. HUD- soN, a citizen of the America, anda resident of United States of Cincinnati, in

the county of Hamilton and State of Ohio,

have invented a new and useful ment in a Heel-Building Machlne,

cation.

the following is a specifi This invention relates machines andpartlcularly Improveof which heel-building to machines to be used in thebuilding of rough heel blocks from stock leather blanks.

Heretofore the manufacture of rough heel blocks has been conducted bythe building up leather in a series of clamps,

which travelled about were hand operated,

all of which a large wheel or belt and eventually returned to the placeof the beginning.

of the wheel, the glue blanks would dry, and block turned to the opingthis movement used to secure the when the dry rough erator, the operatormove the block and then new block and place it in would Durmanuallyreproceed to build a the emptied clamp.

An object of my invention is to provide a device for building rough heelblocks in which the block ismutomatmally secured in the clamps anddischarged therefrom.

Another object is to provide means whereby heel blocks can be built thanhas been possible hereto Another object is the purposes stated cient inoperation.

Another object is to the'purposes stated, wherein more quickly fore.

to provide a device for that is simple and effiprovide a device for theparts are readily adjustable to permit varylng of the pressures exertedupon the heel blocks,

and

to permit adjustment of the parts to accommodate various sizes andshapes of blocks built thereon.

These and other objects are attained by the means described herein anddisclosed in the accompanying drawings,

Fig. 1, is a front bodying my invention.

Fig. 2, is a rear view vice shown in Fig. 1.

Fig. 3, is a sectional Fig. 1.

Fig. at, is a plan view of a' in which elevation of a device emof partsof the de view on line 3-3 of modified form of a discharge mechanismforming a detail of my invention.

Fig. 5, is an enlarged front view of a clamp forming a detail of myinvention.

which rough of layers of Serial No. 461,821.

Fig. 6, is a sectional view on line 6-6 of Fig. 5.

Fig. 7, is an enlarged sectional view taken on line 77 of Fig. 6.

My invention comprises a revoluble support d upon the periphery of whichis mounted a series-of heel clamps H upon heel blocks K are built up.The support d is intermittently actuated by means of a motor 6 adaptedto transmit rotatory motion to the\ support and a suitable means such asthe foot lever 6 is provided to control the transmission of power fromthe motor to the support. wheel E is engaged by the yoke h of the clampsand is adapted to co-operate with certain other mechanisms inautomatically moving the yokes into and out of clamping the worm I)mounted on the shaft 6 driven by the motor I). The shaft?) is supportedby suitable brackets 19 A clutch shoe b is mounted on the shaft 6 and isadapted to revolve with the worm wheel I). A clutch b is fixedly mountedon the shaft 1) and has formed Within it a bore 19 parallel with theshaft 6. A slot 7) extends between the bore 6 and the outer surface ofthe clutch. A pin 19 is reciprocally mounted in the bore 5 and hasextending from it the lug 6 extendingthrough the slot 7). A spring 6 ismounted in the bore 6 and tends to move the pin 6 out of the bore 12 Theshoe 6 has a series of notches 19 adapted to be moved into registrationwith theflpin 6 whereby it is possible to transmit motion from the shoeand the worm wheel to the clutch, when the pin b engages in one of thenotches 6 The rod Z2 is reciprocally mounted upon the brackets 5 whichmay in turn be mounted upon the brackets 5 A spring 19 is adapted toyieldingly retain the rod 6 in engagement with the clutch b. Thisisaccomp-lished by securing one end of the spring 72 to a bracket b andsecuring the other end of the spring to the rod 1). The upper endof therod 5 has a face 1) formed thereon and disposed at such an angle thatwhen the lug b on the pin 72 engages and is moved over the face Z), the

Acamthrough slots 6 lug 5 and the pin 6 will be moved against the spring6 whereby the pin 6" is retained wholly within the body line of theclutch If. A cable I) is secured to the rod Z) and is adopted to beactuated by means of a foot lever 23 secured upon a platform a formingpart of the frame A. The foot lever 6 cable 6 and rod I) bear suchrelation that when the foot lever is depressed. the rod 6 is disengagedfrom the lug 6 The forward end of the drive shaft Z) is mutilatedwhereby a lug 6 is formed thereon. A collar 1) is mounted upon the shaftZ) adjacent to the forward end thereof, and has a stud 6 formed thereon.The forward face 6 of the stud 6 is spaced from and does not engage thesupport (5. A driven shaft cl is revolubly mounted upon the frame A andhas mounted upon its forward end a support (Z. The support as shownherein is circular in form. A gear d ismounted upon the shaft (Z and isadapted to transmit rotatory motion to the support (5. The gear (Z has aseries of alternating deep and shallow notches (Z and (Z respectively.The notches d and (Z are spaced by the faces (Z formed on the gear. Thestud 6 formed on the sleeve 1) is adapted to engage in the deep notches(Z and the lug 6 formed on the shaft 5 is adapted to engage in theshallow notches 6Z A stationary cam wheel E is mounted upon the frame Aadjacent the support cl. The locking cam c is mounted upon the cam wheelE and has a ledge 6 having a cam face 6 eccentric to the shaft (Z andthe support CZ. The forward or upper end 0 of the ledge formed on thelocking cam is formed into a shoulder 6 extending away from the shaft(Z. The locking cam is adjustably secured upon the cam wheel E by anysuitable means such as being bolted upon the cam wheel, the bolts 6passing in the locking cam. A discharge spring e is mounted upon camwheel E on the side opposite the locking cam on approximately the samelevel with the locking cam. A disc a is mounted on cam wheel E inalignment with the spring 0 and the shaft (Z. The purposes of theseelements will be more fully explained hereafter. The outer edge orperiphery of the cam wheel E has formed on it a way or track (2 that isengaged by the clamps H. At the top of the cam wheel E the track 6extends away from the support (Z for a reason that will be explainedhereafter.

n unlocking cam F is mounted upon cam wheel E adjacent to the spring 6and has a lug f formed thereon. The upper or cam face 7" of the lug f isadapted to engage the clamps and to unlock them in a manner that will beexplained hereafter. The lug 7 extends upwardly on. a line substantiallytangential to the periphery of the cam wheel E.

A U-shaped bracket G is mounted upon the cam wheel E and has an arm 9extending over the unlocking cam F. The bracket G is positionedintermediate the spring 6 and cam F. The forward branch 9 of the bracketG has extending from it, the guide arm 9 adapted to engage the forwardor front side of the clamps as they pass by and to retain the clamps inengagement with the track c. It is at this place that the upper end ofthe track extends away from the support all. The branches of theU-shaped bracket are so disposed that part of the clamps will passbetween them.

Each clamp H comprises a base it upon which is pivotally mounted one endof a bottom plate it, by means of pivot 71/. A transverse cam shaft 72is mounted revolubly upon the base and has formed upon it a cam hadapted to engage the plate It and to adjustably retain the plate at adeterminable inclination to base it. A bolt it extends reciprocallythrough the bores 72/ in the plate, It in the base 71, and (l in thesupport d. The bore 7L7 is countersunk as shown at [L and is adapted toaccommodate a head It formed on one end of the bolt and which normallyengages the plate 71.. A head it formed on the other end of the bolt isadapted to engage the disc 6*. A spring h mounted upon the bolt engagesthe head it and the support d, and yieldingly retains the head It inengagement with the plate It. Adjustable rods 11 are mounted upon thebase 7L and extend upwardly from the base adjacent the free end of theplate it. These rods are connected. at their tops by bar it having a lipIt under which the heel blanks are inserted as the heel block is builtup. The lip retains the blanks upon one another until the clamp securesthe heel block. The rods serve as an abutment for the forward ends ofthe heel blanks and also as a gage for the guidance of an employee inbuilding up heel blocks. The cam shaft 71. has an apron 72. formedthereon adapted to lie upon the side of the base. The apron has a slot72 concentric with the shaft 72 A bolt 7t extends thru the slot [L12 andengages in a threaded way formed in the base. The head of the bolt it isadapted to engage and lock or clamp the apron upon the base, whereby thecam shaft may be secured in an adjusted position. The base is securedupon the support 0? by any suitable means such as bolts it. A yoke 72.has its branches it and 71. pivotally mounted upon the ends of the baseIt by means of the adjustable bearings or pivots 72/ and 71respectively. The pivots 72 and it engage in the bores it and itrespectively in the base It. A bore 71 parallel with the branches it"and arms h and h.

' in the position shown as it extends thru the body it of the yoke andin this bore is slidably mounted a sleeve it having within it a threadedway in which an adjustable screw 77. engages. A top plate it is mountedupon th-elower end of the screw 72/ by means of a pivot h A. U-shapedclip I! is. removably mounted upon one end of the top plate h, extendsslidably about the branch it and serves to prevent rotation of the topplate and the screw it. The lugs 7H formed on the yoke body It extendfrom the yoke body in a directionopposite to the branches 71." and 72..The bore h in the yoke registers with the space between the lugs h Atransverse slot h is formed in each lug, these slots registering withthe space between the lugs and being in alignment with one another. Apin it is reciprocally mounted in the slots h and extends thru the armsh and it formed upon the upper 7 end of the sleeve h. A spring it isdisposed about the upper end of the sleeve h and one end thereof issecured upon the pin 7 and the other end thereof abuts the yoke body it.A roller h is mounted upon the pin 71- intermediate the A shaft 71 ismounted upon the upper end of the lugs k and has rotatively mounted uponit, intermediate the lugs, a lever arm h. The lever arm has a cam face7:. formed thereon, which face terminates at the shoulders 712' and itformed on the lever arm. The shoulders are adapted to engage the rollerh and to thereby limit the movement of the lever arm.

A roller it is mounted upon the shaft h mounted on the free andbifurcated end of the lever arm. The shaft it extends beyond the leverarm as shown in Fig. 6, for a purpose which will be v explainedhereafter. Lugs h and it are formed on the rear of the yoke body andhave disposed between them a roller h revolubly mounted upon a shaft hextending thru the lugs 72k and it.

The operation of my device is as follows:

The operator takes his position upon the platform a and builds a roughblock K upon the bottom plate h when a given clamp H is X, Fig. 1. Inthis position the yoke extends from the base in such direction that thebranches assume a substantially horizontal position.

After the operator has built block K upon the clamp in position X, byplacing glue on several leather blanks and mounting the blanks ononeanother, he operates the foot lever I), thereby disengaging the lug band the rod 6 whereupon. the spring 5 causes the pin to engage in one ofthe slots 71 in the clutch shoe 7) The shaft 6 and the sleeve 1) aretherefore rotatively actuated by the worm wheel 5. The stud 5 engagesthe gear 03 and moves same, see Fig.;1, in a counter clockwisedirection. The mutilated end of the shaft 6 permits the faces d on thegear to pass the shaft Z), and when the next shallow notch registerswith the shaft '5, the mutilated end or lug 5 enters in the shallownotch and secures the gear against further motion. During this time theclutch 7) has made one complete revolution and providing the operatorhas released the foot lever I), the rod 7) will engage the lug Z2 andthereby disengage the pin 5 from the clutch shoe 6. This movement of thegear is sufficient to advance the clamp shown at Y, Fig. 1, to theposition X.

The roller it engages the track 6 on the cam wheel E, and as the clampsare moved towards the locking cam e, the yokes of the clamps are movedto positions so that the top plates 72 are disposed over and above therough heel blocks this position the roller 71, on the lever arm 72,engages the shoulder 6 formed on the ledge e on th locking cam. As theroller passes over the locking; cam, the roller is moved towards the.shaft 03, whereby the cam face it on the lever arm 723" is moved overthe roller 72, mounted on the sleeve 71 thereby causing the top plate hto be moved upon and clamped upon the rough heel block K, and tensioningspring it. When the roller 7L engages the shoulder h the lever arm islocked upon the yoke. The heel block is retained under pressure in thisclamped position until the clamp has moved to a position wherein theshaft h engages the unlocking cam F. The rough shoe block is graduallyreleased from the pressure exerted thereon by the clamp when the shaft hengages the cam face f which serves to move the roller it away from theshaft (Z, whereupon the roller engages the arm 9, nounted on bracket G.The arm g is so formed that the roller is gradually extended. The springit retains the roller in engagement with the arm g, wherefore thepressure on the heel block is gradually decreased. By the time that theclamp reaches the position Z, the lever arm has been fully extended andthe heel block is ready to be discharged from the clamp. At this timethe head 72F of the bolt 72: engages the disc 6 and the head h thereofis projected from the bore in the bottom plate h, and unseats the blockK from the bottom plate It. At approximately this time the spring 6engages the rear of the blocleK, and between the spring 6 and the bolth, the block K is ejected forwardly from the clamp and falls into asuitable container provided therefor. At about this time-the guide arm gengages the forward lug h formed on the yoke and serves to retain theroller if? on the yoke track 6 which at this place extends rearwardlyfrom the support rZ, wherefore the yoke and the branches move aboutpivots h and If, whereupon the yoke is moved by gravity to such a posi-K. "When in tion that the branches are in a substantially horizontalposition, whereupon the operator can build up another heel upon theempty clamp.

The adjustable rods it serve as a gage or guide whereby the operator candetermine the height to which he should build up a heel block. A.suitable stand A is constructed above the support (Z and upon which theheel blanks or lifts may be disposed. The heel lifts are glued at thetime that they are placed upon the bottom plate It by the operator, andwhen they are discharged they have dried. The lip h on' the bar itmounted on the gage rods serves as a retaining means under which theheel blanks are retained until the top plate clamps the heel block. Acheck it may be mounted adjustably upon the base a so that it willextend over the bottom plate and serves as an abutment for the lowermostheel blank to prevent slippage or movement of the lowermost heel blankwhile the heel block is being built up.

The knock out mechanism M disclosed in Fig. may be employed to supersedethe spring 6* and perform the function thereof. The mechanism comprisesa rod m pivotally mounted intermediate its ends upon the frame A byIllQZlIlSOTE a pivot on, the rod having an angular face m on one endadapted to be engaged by the block m mounted on the clutch b and to bemoved thereby against the yielding resistance of spring m mounted at oneend on frame A and at its other end upon the rod m. A reciprocating armm is pivotally mounted at one of its ends upon the other end of the rodand extends intermediate its ends thru the frame A at approximately theplace where the spring 6* is mounted (see Fig. 1). A head m is mountedon the free end of the arm and is adapted to be moved into engagementwith a heel block K when a clamp assumes the position Z, therebyejecting the heel block from the clamp. The arm m extends reciprocallythrough a sleeve m mounted on the frame, the sleeve serving as a stopdetermining the forward limit to which the head m may be moved. Thislimit is such that the head wa will not interfere with the movement ofclamps.

hat I claim is:

1. In a heel building machine the combi nation of a cam wheel, a trackon the cam wheel, a revoluble support mounted adjacent the cam wheel,clamps mounted on the support adapted to receive heel blocks andcomprising a base, a yoke pivotally mounted on the base and engaging thetrack whereby the yoke is alternately moved to and from an operativeposition over the base, means on the yoke adapted to be moved intoclamping engagement upon a heel block when the yoke is in an operativeposition, and a lock ing cam mounted adjacent the support adapted tomove the last mentioned means into clamping engagement upon a heelblock.

2. In a heel building machine the combination of a cam Wheel, a. trackon the cam wheel, a revoluble support mounted adjacent the cam Wheel,clamps mounted on the support adapted to receive heel blocks andcomprising a base, a yoke 'pivotally mounted on the base and engagingthe track where by the yoke is alternately moved to and from anoperative position over the base, means on the yoke adapted to be movedinto clamping engagement upon a heel block when the yoke is in anoperative position, a locking cam mounted adjacent the support adaptedto move the last mentioned means into clamping engagement upon a heelblock, and

an unlocking cam mounted adjacent the support adapted to move said lastmentioned means from clamping engagement upon a heel block.

3. In a heel building machine the combination of a cam Wheel, a track onthe cam wheel, a revoluble support mounted adjacent the cam wheel,clamps mounted on the support adapted to receive heel blocks and comprising a base, a yoke pivotally mounted on the base and engaging thetrack whereby the yoke is alternately moved to and from an operativeposition over the base, means on the yoke adapted to be moved intoclamping engagement upon a heel block when the yoke is in an operativeposition, a locking cam mounted adjacent the support adapted to move thelast mentioned means into clamping engagement upon a heel block, anunlocking cam mounted adjacent the support adapted to move said lastmentioned means from clamping engagement upon a heel block a boltmounted reciprocally upon the base adapted to separate a heel block fromthe base, and means adapted to actuate the bolt upon the release of theheel block from the clamping means.

4. In a heel building machine the combination of a cam wheel, a track onthe cam wheel, a revoluble support mounted adjacent the cam wheel,clamps mounted on the sup port adapted to receive heel blocks andcomprising a base, a yoke pivotally mounted on the base and engaging thetrack whereby the yoke is alternately moved to and from an operativeposition over the base, means on the yoke adapted to be moved intoclamping engagement upon a heel block when the yoke is in an operativeposition, a locking cam mounted adjacent the support adapted to move thelast mentioned means into clamping engagement upon a heel block, anunlocking cam mounted adjacent the support adapted to move said lastmentioned means from clamping engagement upon a heel block, a boltmounted reciprocally upon the base adapted to separate a heel block fromIll) an unlocking the base, means adapted to actuate the bolt upon therelease of the heel block from the clamping means, and a knock-outdevice adaped to co-operate with the bolt whereby a heel block isejected from the base.

5. In a heel building machine, the combination of a vertical cam wheel,a track on the cam wheel, a revoluble support mounted verticallyadjacent the cam wheel, the cam wheel and track thereon extending away.

from the top of the support, clamps mounted on the support adapted toreceive heel blocks and comprising a base, a yoke pivotally mounted onthe base, a roller mounted on the yoke and engaging the track, means toretain the roller upon the track, the engagement of the roller with theportion of the track extending from the support serving to permitmovement of the yoke upon the base whereby the yoke assumes aninoperative position as the clamp moves towards the top of the support,and is moved towards an operative position as the clamp moves from thetop of the support, means mounted on the yoke adapted to clamp a heelblock upon the base when the yoke is in an operative position, means tomove the clamping means upon a heel block, means to release a heel blockfrom the clamping means, and means adapted to intermittently actuate thesupport.

6. In a heel building machine the combination of a cam wheel, a track onthe cam wheel, a revoluble support mounted adjacent the cam wheel,clamps mounted on the support adapted to receive heel blocks andcomprising a base, a yoke pivotally mounted on the base and engaging thetrack whereby the yoke is alternately moved to and from an operativeposition over the base, the yoke having a bore in substantialparallelism with its branches, a sleeve mounted reciprocally in thebore, means yieldingly resisting movement of the sleeve towards thebase, a screw mounted adjustably upon the sleeve, a plate mounted uponthe screw adapted to engage a heel block mounted upon the base, a levermounted upon the yoke and engaging the sleeve and controlling themovement of the sleeve, a locking cam mounted adjacent the supportadapted to engage the lever whereby the plate is moved towards the base,means to lock the lever, and plate at the end of their movements towardsthe base, cam adapted to unlock the lever and the plate, an arm mountedadjacent the unlocking cam adapted to engage the lever and to permitgradual movement of the plate from the base, means to eject a heel blockfrom the base when the plate has reached the end of its movement awayfrom the base, and means to intermittently actuate the support.

7. A. clamp comprising a base, a bottom plate pivotally mounted on thebase adapted to receive a heel block, means to adjust-ably incline thebottom plate over the base, a yoke pivotally mounted on the base adaptedin an operative position to extend over the bottom plate and in itsinoperative position to assume a position to the side of the bottomplate, a top plate mounted reciprocally on the yoke, and means to clampthe top plate upon the heel block when the yoke is in an operativeposition.

8. A clamp comprising a base, a plate pivotally mounted on the baseadapted to receive a heel block, means to adjust-ably incline the plateover the base, a yoke pivotally mounted on the base adapted in anoperative position to extend over the plate and in its inoperativeposition to assume a position to the side of the plate, means mounted onthe yoke adapted in the operative position of the yoke to clamp a heelblock upon the plate and means adapted to eject a heel block from theplate when the yoke is in an inoperative position.

9. A clamp for building heel blocks comprising a base, a yoke thebranches of which are pivotally mounted on the base and having a bore insubstantial parallelism with the branches, a sleeve mounted reciprocallyin the bore, a plate mounted on the sleeve intermediate the branches, alever mounted on the yoke, means yieldingly retaining the sleeve inengagement with. the lever, the lever and sleeve being adapted tointerlock, whereby the plate is moved and locked into clampingengagement upon a heel block, and a roller mounted on the lever adaptedto engage a cam adapted to interlock the lever and the sleeve.

10. A clamp for building heel blocks comprising a base, a yoke thebranches of which are pivotally mounted on the base and having a bore insubstantial parallelism with the branches, a sleeve mounted reciprocallyin the bore, a plate mounted on the sleeve intermediate the branches, alever mounted on the yoke, means yieldingly retaining the sleeve inengagement with the lever, the lever and sleeve being adapted tointerlock, whereby the plate is moved and locked into clampingengagement upon a heel block, a roller mounted on the lever adapted toengage a cam adapted to interlock the lever and the sleeve, and a shaftextending from the lever adapted to engage acam adapted to unlock thelever and sleeve whereby the heel block may be removed from the base.

11. A clamp for building heel blocks comprising a base, a yoke thebranches of which are pivotally mounted on the base and having a bore insubstantial parallelism with the branches, a sleeve mounted reciprocallyin the bore, a plate mounted on the sleeve intermediate the branches, alever mounted on the yoke, means yieldingly retaining the sleeve inengagement with the lever, the

lever and sleeve being adapted to interlock, whereby the plate is movedand locked into clamping engagement upon a heel block, a roller mountedon the lever adapted to engage a cam adapted to interlock the lever andthe sleeve, a shaft extending from the lever adapted to engage a camadapted to unlock the lever and sleeve, whereby the heel block may beremoved from the base, a bolt mounted reciprocally on the base, a headon the bolt adapted to eject a heel block from the clamp, and meansyieldingly retaining the head on the base whereby a heel block may bebuilt thereover.

12. A clamp for building heel blocks comprising a base having a bore, ayoke, branches on the yoke, pivots connecting the branches and the base,the yoke having a bore substantially parallel with the branches, asleeve mounted reciprocally in the bore in the yoke, a screw mountedadjustably in the sleeve and extending between the branches insubstantial parallelism therewith, a plate mounted on the screw, a clipmounted removably on the plate and slidably engaging one of thebranches, a roller mounted on the sleeve, a normally extended leverpivotally mounted on the yoke engagingthe roller, a spring yieldablyretaining the roller in engagement with the lever, a roller mounted onthe lever adapted to engage a locking cam adapted to move the lever to acontracted position, and to engage an arm adapted to permit gradualmovement of the lever to an extended position, means to interlock thelever and roller when the lever is moved to a contracted posit-ion, ashaft extending from the lever adapted to engage an unlocking cam whereby the roller and lever are unlocked and the lever is graduallyextended, the plate and base being adapted to have a heel block clampedbetween one another when the lever is moved to a contracted position,and a bolt mounted reciprocally in the bore in the base adapted todischarge a heel'block from the base when the lever is extended.

13. A clamp for building heel blocks comprising a base adapted toreceive a heel block, a yoke pivotally mounted onthe base, means mountedon the yoke adapted to be moved into clampingengagement upon a heelblock, and an adjustable gage mounted on the base adapted to serve asaguide and as a brace against which the heel blanks are nested whenbeing assembled into a heel block, the gage being provided with a lipextending over the base, between which lip and base the heel blanks arenested.

14. In a heel building machine the combination of a. cam wheel, a trackon the cam wheel, a revoluble support mounted adjacent the cam wheel,clamps mounted on the support adapted to receive heel blocks andcomprising abase, a yoke pivot ally mounted on the base and engaging thetrack whereby the yoke is alternately moved to and from an operativeposit-ion over the base, means on the yoke adapted to be moved intoclamping engagement upon a. heel block when the yoke is in an operativeposition, a locking cam mounted adjacent the support adapted to move thelast mentioned means into clamping engagement upon a heel block, anunlocking cam mounted adjacent the support adapted to move said lastmentioned means from clamping engagement upon a heel block, andreciprocating means adapted to separate a heel block from the base uponthe release of the heel block from the clamping means.

15. In a heel building machine the com bination of a cam wheel, a trackon the cam wheel, a revoluble support mounted adjacent the cam wheel,clamps mounted on the support adapted to receive heel blocks andcomprising a base, a yoke pivot-ally mounted on the base and engagingthe track whereby the yoke is alternately moved to and from an operativeposition over the base, means on the yoke adapted to be moved intoclamping engagement upon a heel block when the yoke is in an operativeposition, a locking cam mounted adjacent the support adapted to move thelast mentioned means into clamping engagement upon a heel block, anunlocking cam mounted adjacent the support adapted to move said lastmentioned means from. clan'iping engagement upon a heel block, and aknock out mechanism adapted to separate a heel block from the base uponthe release of the heel block from the clamping means.

16. A clamp for building heel bloc-ks.

comprising a base, a plate pivotally mounted at one end on the base, acam revolubly mounted on the base adapted to engage the plate and tomove the plate about its pivoted mounting, and means to clamp a heelblock upon the plate.

17. A clamp for building heel blocks comprising a base, av plate mountedpivotally upon the base, a cam revolubly mounted on the base adapted toengage the plate and to move the plate about its pivoted mounting, meansto lock the cam upon the base, and means to clamp a heel block upon theplate.

18. A clamp for building heel blocks comprising a base, a plate mountedpivotally uponthe base, a cam revolubly mounted on the base adapted toengage the plate and to move the plate about its pivoted mounting, meansto lock the cam upon the base, means to clamp a heel block upon theplate, and a check adapted to preclude slipping of the heel on theplate.

In testimony whereof I have hereunto subscribed my name this lSth da 7of April, 1921.

ALEXANDER A. HUDSON.

